Blowdown Valve Merk Gestra Type MPA 46

Description

The following rapid-action intermittent blowdown valves are
installed in pipes to discharge boiler blowdown water:
n Rapid-action intermittent blowdown valve PA 46, PA 47
or PA 48 (manually operated)
n Rapid-action intermittent blowdown valve MPA 46,
MPA 47 or MPA 48 (automatically operated)
The equipment is designed for discharging boiler blowdown
water with non-metallic solids from steam boilers.
The equipment may only be used within the admissible
pressure and temperature limits, with due consideration of
chemical and corrosive influences.

Function

When the intermittent blowdown valve opens, the large
cross-sectional area of the orifice creates a suction effect,
precipitated sludge and sediments.
Type PA valves are intended for manual operation. For the
blowdown process, the valve is opened fully by hand with the
lever for around two to three seconds. The spring-loaded valve
cone is forced out of the valve seat. As a result, accumulated
sludge and sediments rush out of the open valve. When the
manual lever is slowly released the spring forces the valve
cone back into the valve seat and the valve is closed rapidly.
Type MPA valves are equipped with a diaphragm actuator for
automatic operation. Compressed air or pressurised water is
used as the control fluid. The diaphragm actuator opens the
intermittent blowdown valve to perform a brief blowdown.
The following control units can initiate the opening of the
valve:
– the TA program controller, see data sheet,
∗ the continuous blowdown controller LRR 1-40,
LRR 1-52, LRR 1-53,
LRR 1-60, see data sheet, or
– the SPECTORcontrol with CAN bus.